This stamp can not be a 594, right? Please take a look at the series of scans if you have a moment.
The 1 cent Franklin stamp appears to align with a perf. 11 stamp in both directions (per image 3 and 4) and also appears to be significantly larger then a flat plate stamp horizontally and slightly larger vertically.(per image 6-8)
However, I am certainly aware that the overwhelming odds are clearly against me... (Please excuse the "jury rigging" tools used in the photos)
The green arrow cutting line and its strait edge on top of the 1 cent stamp is found on flat plate stamps such as # 552. The 2 cents stamp next to it on its left appears to be a rotary press stamp # 583 and it is better to compare it against this stamp which is longer that the stamp on the right. In other words, the rotary press 2 cents red stamp on the left shows by its longer length that the 1 cent green stamp on the right is not a rotary press stamp but a flat plate press stamp (in addition to the green cutting line and straight edge on the top of the stamp).
Also, when comparing Flat plate vs. Rotary press for sizing I believe you can only compare within the the 4th bureau issue. You are comparing it to a different Washington / Franklin series which I don't think is accurate.
This will help you to determine what printing method was used for a given stamp. In principle, the method is the same for the 4th. bureau issues of 1922-1934 with the exception of there being no off-set printed 4th. bureau issues. You must use stamps from the same issue to make the comparison: 3rd. bureau for 3rd. bureau stamps and 4th. bureau for 4th. bureau stamps. Don't interchange them.
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